Everything you described is simply ways that rich people avoid living around poor people. Yes, it generally excludes blacks, but that's incidental and only because blacks tend to be poor.

On the flipside, these policies keep out poor whites as much as poor blacks, for the exact same reasons.

Rich black basketball players, musicians, doctors and politicians have no problem living in mostly-white neighborhoods. Of course, rich Asians also have no trouble living in white neighborhoods, because there are no racial segregation policies.

I find it amazing how you attribute the simple dynamics of people sorting themselves by wealth, which have been very strong in all urban societies everywhere ever, and make them out as though they're some sort of racial targeting system. e.g. 19th century Paris was almost all white French and had the same wealth clustering patterns for the same fundamental reasons.